Three advantages and disadvantages of slash and burn farming ​

Slash and burn agriculture also known as primitive subsistence farming is used by arrivals mostly.

Although it has quite a few advantages it also has a few disadvantages. 

1). This type of farming cannot feed a lot of people. It can be used only by the people of the family.

2). The land that has been used once cannot be used again .

3). This kind of farming requires the farmer one the family to change their lands again and again.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

a. "how old man winter was driven back” and “ormuzd and arimanes"